tough

I don't think it is easy to find any flaw in the procedure.

supported by probable cause, police officer can make warrantless arrest. probable cause arises when
(1) the police officer saw the crime committed;
(2) the facts and circumstances taken together indicate the crime has been committed.

Problem (1) why you tried to alter/erase the information on your ID -- A reasonably prudent person under similar circumstances would not have done that.

Problem (2) Why you decided to take other people's property without permission? Why you refused to comply when the cop requested you to return the book? -- arguably probable cause, and almost constituted all elements for common law larceny

(1) wrongful taking personal property of others;
(2) intent not to return and permenantly deprive the truth owner of possession;


"當事人應該找自己要好的老師和同學為自己作證，證明自己一直行為良好，學習也不錯。如果因為這樣一點點不當的行為讓他這樣一個還沒有邁出校門的學生背負這樣的罪名是過分了。"

-- may not be a good idea. Character evidence generally not admissible to prove you acted in conformity with that character. plus once you try to introduce your character evidence, this opens the door for prosecutor to introduce witness' tesitmony regarding the same trait of character (such as dishonesty -- for example only, not referring to you). (this part may not be accurate, need you to check with your attorney;)

It is not necessary to go that far actually. try to get rid of the case at earlier stage as you can.